In order to solve the problems of low efficiency and backward methods in the agro-technical extension activities, this paper designed an agro-technical extension information system based on cloud storage technology. This paper studied the key technologies, such as cloud storage service engine, cloud storage management node and cloud storage data node and designed the overall architecture of the agro-technical extension information system based on cloud storage technology. The application results demonstrate that this system has significantly improved the agro-technical extension service levels and cloud storage can greatly improve data storage capacity of the agricultural extension information system.